Paint mask structure



Aug. 31, 1943. J. E. DUGGAN I 4 PAINT MASK STRUCTURE Filed May 18, ,1942

FIGJ.

INVENTOR.

JAMES EDWARD DUGGAN ATTORNEYS Patented Au gt 31, 1943 I t mmemmtemtmaum etmmt znerefiin tnowtothezumvmg, Afisfa {propeller areused during paintingionplatingoperations to hub rhnvingzawc ntral opening I for asupport protect portions tots-articles from paintror tplatmg :Ing xhaft "(not shown) "and having fourradially material applied to -adjaoentzportions rthereof, and extending outwardly opening substantially cuprefers more particularly to a ipaintmask forpor- J'sh'aped ithroats -orsockets *H, and His a :pro-

wommpanm drivwina; wherein Jim; C

' 'viemflmmrghiihetmuataanatshowingin section mnbea insimmfl plane. i l fmolmteddnoxreof thethroats ll. t

- Heretofore itwhas been customary in aoobrd- As msual reagch throat l l lwisva rounded bottom ance with the govenunent specifications tosprovide or rclosed "end :18 andvfis "provided between said methtoatof 1a propeliephuh with a bearing surbottom and the outer openen'd thereof with a Jortheshank of the propeller blade-and with rhea-ring surface 14 and internal thrieads an iizhternal threadffor' 'the llock wring employed to IE. Prefer-ably the hea-ring surface a H is at the holdthe shank df'ltkie bladeonrsaid beaningsiirinner endxof thethroatand extends from a sh'ouh t taoe. lt has ralso been customary to paint or der 16 at the rim of the rounded'bottom 134:0 an

platethe elo'sedinnerjlend of thebottom'o'ffthe .tannnla-n re'cess 'or figroove "H spaced :fromthe throat. Usually-the painting ior p ating jo'Deraouterend of the throat, :W-hile the threads 1-5 are is perforined AaIt'erQthebearin'g"suhfacefand adjacent theputer'eridofythe throatand extend 'thrjeadskmentioned have been: formed in the from -the groove ill to 'a poin't near Ethe :outer end w thrjo'at, consequently :itis dimcuit tof keep sue'h of the threat. The shank 12 --of the-{propeller paint orllplatingmaterial froInjnassingpntb and 20 -blade-is concentric with:the'bearing smrfacefl4 I theibea'ring surfaoeland threads; "Howand is adapted t -tq;r-n "therein; (feathering).

preventisuch, Impairment some paint for plating provided 1m; the surface 4 4, and any suitable material was deposited i'u'pon' either 'thefbea r in'g means such 8,5 th e' -lock ring l9 may-he engaged flisjurface'oifthe threads and hadtobe removed. with the;intema1;:threads- -l=5 g to hold the shank Thisfte'qnird vefyea'refuhwork andconsidei-able -12 rin assembled relation withthe throat.

t ii 'hfhence waseostlyand delayed produet itn. For proteoting the 'beai'ing; surface n and gii'Thus, one pf th essential objects of thepresent -threadsl-li -from paint or platingmaterial"applied $9 1 29 Mm zmm i-rli ate p ovided We, n 121? S11 $3.533 mi iflxwt 1 Bl. weetie, B eieestm, m 36,; wa a t ntie meuet immomtm not U3 e min Figure 2 is an enlarged long aimrouml mast 2.6;i a eramioutmamrzb xmend tit *ze taide dimmio ithe en etsemente media itudinal sectional m neub tame wamuamt I wl sizth the it mask embodying my invention appl ed 3318mm 533bt t stantiallyQequal ,to the inside diameter of the Figure sis a perspective view of the mask outer end portion 25 of the throat, per i In use, the mask 0 is folded or doubled up,

i. e., one Wall thereof is drawn or pressed in toward the opposite wall, thereof to reduce the over-all outside diameter of the mask to permit it to be inserted into the throat l l to the position illustrated in Figure 2. When in this position the lower enlargement 23 bears firmly against and has sealing engagement with bearing surface [4 and shoulder l6, while the upper enlargement 2| bears firmly against and has sealing engagement with the outer end portion 25 of the throat. The enlargement 22 covers the threads l5. Moreover, air is pocketed in the space 26 between the smooth exterior surface 21 of the mask and the bearing surface l4 and. recess I! when the doubled-up mask is released within the throat and snaps into the position illustrated in Figure 2. Instead of air being pocketed as described such air may be expelled by hand pressure against the resilient mask to create a vacuum in the space '26. In either instance paint or plating material will be excluded from the space 26. Thus,' the bearing surface l4 and threadsl5 are thoroughly and effectively protected by the mask from paint or plating material applied to the bottom l30f the throat. In this connection it will be noted that the inner end portion 28 of the maskis bevelled to eliminate any obstruction? to thepassage of paint or plating material onto the bottom l3 of the throat. Moreover, is such that a spray gun orplating apparatus (not shown). may be inserted into or through the mask to paint or plate the bottom iii of the throat. Normally the resiliency of the 'rubber or rubber composition from which the mask C is made is such that the mask will inherently rea the shape of the mask C main tight against theportions' l4, iii-and Z5 mentioned of the throat, however to be doubly safe a metal expanding ring 29 of "spring'steel maybe employed upon the inside of 'themask at its upper or outer end to hold and maintain the mask tight against the throat.

' What I claim as my invention is: 1. A mask for a bearing surface and threads upon the inside of a cup shaped throat of apropeller hub, comprising a resilienttubular mem ber substantially equal in length to the-depth of the throat and insertable Within said throat to form a protecting sleeve over said surface and threads, saidmember having three external enlargements; one being provided-for sealing engagement with said throat at the outer end there of beyond said threads, another being adapted to span said threads, and the third being provided for sealing engagement with a portion of the throat near the inner end or bottom thereof. 1

r 2. Means for protecting a finished interior bearing surface and internal threads disposed adshapedmember to cover simultaneously largements to exclude paint and plating material applied to the bottom of said cup-shaped member.

3. Means for protecting a finished interior bearing surface and internal threads spaced longitudinally apart at one side of a cup-shaped member from paint and plating material applied to the bottom of said cup-shaped member, comprising a tubular member formed of resilient material and operable as "a protecting sleeve within the cup-shaped member to cover simultaneously both the bearing surface and internal threads, said tubular member being provided upon its exterior at longitudinally spaced points thereof with laterally projecting annular enlargements or ribs adapted to have sealing engagement with interior portions of the cup-shaped member adjacent the remote ends of the bearing surface and threads whereby a vacuum is provided between the tubular member and cup-shaped member intermediate said enlargements toexclude paint and plating material applied to the bottom of said cup-shaped member, the inner end of said tubular member being beveled toward the bottom of the cup-shaped member to substantially eliminate any obstruction to the passage of paint or platingmaterial onto the bottom of the cupshaped member from a point within the tubular member.

4. Means for protecting two different longitudinally spaced interior portions of a cup-shaped member from paint and plating material applied to the bottom of said cup-shaped member, comprising a tubular member formed of rubber and operable as a protecting sleeve within the cupthe two longitudinally spaced interior portions aforesaid of the cup-shaped member, said tubular member being provided upon its exterior surface at longitudinally spaced points thereof with laterally projecting annular enlargements or ribs adapted to have sealing engagement with interior portions of the cup-shaped member upon the remote ends of the'two'long'itudinally spaced interior portions aforesaid of the, cup-shaped member whereby a vacuum is provided between the tubular member and cup-shaped member intermediate said enlargements toexclude paint jacent one another at one side of a cup-shaped member from paint and plating material applied to the bottom of the cup-shaped member,

comprising a tubular member insertable within the cup-shaped member as a protecting sleeve to cover simultaneously both the bearing surface and internal threads, said tubular member being provided upon its exterior at longitudinally "spaced points thereof with laterally projecting annular enlargements or ribs adapted :to have.

sealing engagement with interior portions of the cup-shaped member beyond the remote ends of thebearing surface and threads whereby a. vacuum is provided between the tubular-member and 'cup -shaped member intermediate said enand plating material applied to the bottom of the cup-shaped member.

5. Means for protecting an interior finished bearing surface and i'nternalthreads at one side adjacent the bottom and openend respectively of a cup-shaped throat of a propeller hub'from paint and plating material applied to the bottom of said throat,. comprising a tubular member formed of resilient material and operable as a protectingsleeve within the throatto cover simultaneouslyboth the bearing surface and internal threads, said tubular member being provided upon its exterior at opposite ends thereof with laterally projecting annular enlargements or ribs adapted to have sealing engagement with interior portions of the throat at remote ends of the bearing surface and threads whereby vacuum is provided between the tubular member and;throat intermediate said enlargements to exclude paint and plating material applied to the bottom of said throat.

J AMES' EDWARD DUGGAN. 

